<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
.ancestors *{ 
	display: block;
	border: 2px solid lightgrey;
	color: lightgrey;
	padding: 5px;
	margin: 15px;
}
</style>
		<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
		<!--<![endif]-->
		<script type="text/javascript">
$(document).ready(function(){
	$("ul").find("span").css({"color":"red","border":"2px solid red"});
});
		</script>
	</head>

<body class="ancestors">body (曾祖先节点)
	
<div style="width:500px;">div (祖先节点)
	<ul>ul (直接父节点)  
		<li>li (子节点)
			<span>span (孙节点)</span>
		</li>
	</ul>   
</div>
	
	</body>
</html>